St. Leonard Church
Boston, Massachusetts
Services
Mass
Rosary and Mass
Service
Last updated May 2026
~6,100
estimated members
Based on ARDA 2020 data, this is likely one of 54 Catholic congregations in Suffolk County, MA, with an average size of approximately 6,100 members. Catholic accounts for 70% of the county's 496 congregations.
Source: ARDA 2020 Religious Congregations & Membership Study
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